September in Miyakojima averages a daily high of 30.1°C. Expect roughly 13.3 wet days totalling 224.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Miyakojima is October–May.
Based on MIYAKO, JA (1.8km), 1995–2024. 17 years of September data.